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Those convicted of more serious crimes in Bristol often end up at Guys Marsh as the Category C facility holds prisoners serving life sentences as well as those undergoing drug addiction treatment, according to the Ministry of Justice website.

Superintendent Caroline Naughton said: "This was an isolated incident. An investigation is now under way to establish the exact cause of the fire. These enquiries remain ongoing.

"We would like to reassure members of the community that there is no immediate risk to those living in the surrounding area and that the incident is under control."

A Prison Service spokesman added: "There is no danger to the public and staff are working to bring the incident to a safe conclusion as quickly as possible."